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    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>
        td{
            border-radius: 5px;/*css设置圆角*/
        }
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<body>
    <table border="1">
        <tr>
            <td colspan="2">横向合并单元格</td>
            <td>3</td>
            <td rowspan="2">纵向合并单元格</td>
        </tr>
        <tr>
            <td>11</td>
            <td>22</td>
            <td>33</td>
            
        </tr>
    </table>
</body>
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